A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).
Learn more about Dr. David O'Brien:
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Education & Awards
Dr. O'Brien graduated from University of California at Davis.
Dr. O'Brien has 3 hospital affiliations:
- St. Mary Medical Center
- General Hospital
- ST Joseph Hospital-Eureka
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- Additional Information
- Dr. David Raymond O'Brien MD and MS is a male Family Practitioner, has 26 years of experience and practices in Family Medicine.
- Where does Dr. David R. O'Brien practice?
- Dr. David O'Brien has 2 office locations.
Dr. David O'Brien practices Family Medicine near Apple Valley, CA.
Additional practice locations include: Eureka, CA.
See Apple Valley Family Physicians.